inotify: Correctly parse multiple structs at once

When multiple events arrive together, the `Inotify.read()` method parsed
them incorrectly and emitted the same `Event` for each one. This commit
corrects this behavior by appropriately parsing each struct.

src/linuxapi/inotify.py

@@ -173,16 +173,21 @@ class Inotify(object):
 
         buf = memoryview(os.read(self.__fd, self.BUFSIZE))
         nread = len(buf)
-        i = 0
-        while i < nread:
-            wd, mask, cookie, sz = self._unpack(buf)
+        i = begin = 0
         end = self.STRUCT_SIZE
-            while end < nread and buf[end:end + 1] != b'\x00':
-                end += 1
-            name = buf[self.STRUCT_SIZE:end].tobytes()
+        while i < nread:
+            wd, mask, cookie, sz = self._unpack(buf[begin:end])
+            begin = end
+            end += sz
+            x = begin
+            while buf[x:x + 1] != b'\x00':
+                x += 1
+            name = buf[begin:x].tobytes()
             pathname = self.__watches[wd]
-            i += self.STRUCT_SIZE + sz
+            i += end
             yield Event(wd, mask, cookie, name, pathname)
+            begin = end
+            end += self.STRUCT_SIZE
 
     def close(self):
         '''Close all watch descriptors and the inotify descriptor'''